Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
va hanh » van hanh, va thanh, va danh
hai chu » hoi chu, hai chi, hai phu
su sach » so sach, vu sach
cao hoi » cau hoi, cao hoc, tao hoi
hieu ve » hieu va, hieu van
cac toc » cac toi, cac nuoc, cac thoi
ve cac » va cac, vien cac
y nang » ky nang, ly nang, v nang
toc va » hoc va, toc ta, tuc va
co hoi » co hoc, co loi

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ((cao hoi) or (co hoi)). hieu ve cac toc va hanh ((hai chau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ((cao hoi) OR (co hoi)). hieu ve cac toc va hanh ((hai chau) OR (hai chu)) treo.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ((cao hoi) or (co hoi)). hieu ve cac toc va hanh ((hai chau) or (hai chu)) treo*.